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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef SECURITY_RLBOX_UTILS_H_
#define SECURITY_RLBOX_UTILS_H_
#include "mozilla/rlbox/rlbox_types.hpp"
namespace mozilla {
/* The RLBoxTransferBufferToSandbox class is used to copy (or directly expose in
* the noop-sandbox case) buffers into the sandbox that are automatically freed
* when the RLBoxTransferBufferToSandbox is out of scope. NOTE: The sandbox
* lifetime must outlive all of its RLBoxTransferBufferToSandbox.
*/
template <typename T, typename S>
class MOZ_STACK_CLASS RLBoxTransferBufferToSandbox {
public:
RLBoxTransferBufferToSandbox() = delete;
RLBoxTransferBufferToSandbox(rlbox::rlbox_sandbox<S>* aSandbox, const T* aBuf,
const size_t aLen)
: mSandbox(aSandbox), mCopied(false), mBuf(nullptr) {
if (aBuf) {
mBuf = rlbox::copy_memory_or_grant_access(*mSandbox, aBuf, aLen, false,
mCopied);
}
};
~RLBoxTransferBufferToSandbox() {
if (mCopied) {
mSandbox->free_in_sandbox(mBuf);
}
};
rlbox::tainted<const T*, S> operator*() const { return mBuf; };
private:
rlbox::rlbox_sandbox<S>* mSandbox;
bool mCopied;
rlbox::tainted<const T*, S> mBuf;
};
/* The RLBoxAllocateInSandbox class is used to allocate data int sandbox that is
* automatically freed when the RLBoxAllocateInSandbox is out of scope. NOTE:
* The sandbox lifetime must outlive all of its RLBoxAllocateInSandbox'ations.
*/
template <typename T, typename S>
class MOZ_STACK_CLASS RLBoxAllocateInSandbox {
public:
RLBoxAllocateInSandbox() = delete;
explicit RLBoxAllocateInSandbox(rlbox::rlbox_sandbox<S>* aSandbox)
: mSandbox(aSandbox) {
mPtr = mSandbox->template malloc_in_sandbox<T>();
};
~RLBoxAllocateInSandbox() {
if (mPtr) {
mSandbox->free_in_sandbox(mPtr);
}
};
rlbox::tainted<T*, S> get() const { return mPtr; };
private:
rlbox::rlbox_sandbox<S>* mSandbox;
rlbox::tainted<T*, S> mPtr;
};
} // namespace mozilla
#endif
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